How is marriage depicted in the novel? What about love? is there a difference?

Marriage and "love" are directly connected to wealth and power. Love in fact becomes a commodity in this sense. We find out that Daisy was drunk at her bridal dinner and denying that she ever wanted to marry Tom at all. She is clutching a letter from Gatsby (this is implied) and falling apart over her impending wedding to Tom. Daisy however pulls herself together. She marries Tom the next day fully aware that her social and economic status will always be among the filthy rich. Daisy sacrificed her "love" for Gatsby to be a true socialite. Somehow that doesn't sound very romantic!